Boiler



(No Model.)

M. P. BOSS.

BOILER.

No. 557,354. Patented Mar. 31, 1896.

1 ANDREW E.GRAHAM,PHUTO-UTHU WASNINGTDNJIQ NITED STATES PATENT FFICE,

MARTIN P. BOSS, OF SAN FRANCISCO, CALIFORNIA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 557,354, dated March31, 1896.

Application filed September 12, 1895. Serial No. 562,319- (N'o model.)

To all whom it may concern:

Be it known that I, MARTIN P. Boss, a citizen of the United States,residing in the city and county of San Francisco, State of California,have invented an Improvement in Boilers; and I hereby declare thefollowing to be a full, clear, and exact description of the same.

My invention relates to that class of boilers in which an annular seriesof water-tubes encircles the fire-chamber, which has within it awater-column communicating with the chambers in which the ends of thewatertubes terminate.

My invention consists in the combination, with the watertubes, of waterchambers whose walls rest upon supporting-plates, and fastenings betweensaid walls and plates for separating the chamber to expose the tubeends.

My invention also consists, in connection with said annular series ofwater-tubes, of the novel double flaring or conical central water-columnby which the flames and heated products of combustion are directedoutwardly to and among the water-tubes in their 1 course upwardly to thestack.

My invention also consists in other details of construction andarrangement, all of which I shall hereinafter fully describe andspecifically claim.

The general object of my invention is to provide a simple and efficientwater-tube boiler, and the especial object is to provide a means forobtaining ready access to the tubes of the boiler, which said object isaccomplished by rendering the tube-chambers easily separable.

Referring to the accompanying drawing, the figure is a vertical sectionof my boiler.

A is the shell of the boiler, having within it the annular series ofwater-tubes B, which encircle the fire-chamber O, in the middle of whichis the water-column D, communicating at its lower end through a suitablepipe E with the lower tube-chamber F.

The upper tube-chamber G has a communication by means of theradiating-pipes H with the central water-column.

I is the foundation-ring, upon which the lower tube chamber is seatedand to which it is removably secured. This is effected by means ofproviding the bases of the walls of said chamber with the flanges f,with which engage the hooked heads of the bolts J, the shanks of whichfit in notches j in the foundation-ring and receive nuts j. This meansof fastening is a simple and efficient one and may represent anysuitable means by which the tube-chamber is removably secured to thefoundation-plate.

The particular means shown may be readily relieved by loosening the nutand slipping the bolt away from its engagement with the flange of thechamber-wall and without having to entirely remove the bolt itself. I11like manner the upper tube-chamber G is secured to the plate g, intowhich the tops of the tubes are extended, and the parts of the fasteningare designated by the same letters heretofore mentioned with respect tothe parts of the fastening below.

The exit for the flames and products of combustion is shown at K, thegrate-bars at L, and the opening or entrance to the fuel-chamber at Z.

It will be seen that the body of the central water-column is formed of adouble tapering or double conical or bulging shape, which not onlyprovides for an increase of water capacity, but also provides fordeflecting the flames and heated products of combustion outwardly to andamong the water-tubes, from which they may again pass inwardly on theupper slope of the Water-column to their point of exit.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a boiler, and in combination with its tubes, water-chambers inwhich the ends of said tubes terminate, and means for separating saidchambers to expose the tube ends, consisting of plates upon which thewalls of the water-chambeis rest and fastenings between said walls andplates.

2. In a boiler, and in combination with its tubes, Water-chambers inwhich the ends of said tubes terminate, and means for separating saidchambers to expose the tube ends, consisting of plates upon which thewalls of the water-chambers rest, flanges on said walls and clamp-boltswith nuts, seated in slots or grooves in said plates and engaging theflanges.

3. A boiler comprising a shell With a fuelchamber in its lower portion,an annular series of Water-tubes within the shell, Waterchamberscommunicating with the ends of said tubes and having separableconnections with their supporting-plates to expose the tube ends, and acentral Water-column communicating above and below with saidWaterchambers, and having a bulging or conical body.

4:. A boiler comprising a shell having a fuelchamber in its lowerportion, an annular series of Water-tubes within the shell,waterchambers communicating with the ends of MARTIN P. BOSS.

lVitnessos:

M. CROARKIN, A. DUNLAP.

